Masts for HF/shortwave antennas

For transmissions in the shortwave range, there is little to be acquired by adopting the antenna added than a few wavelengths aloft arena level. Shortwave transmitters rarely use masts taller than about 100 metres.

edit Admission for riggers

Because masts, building and the antennas army on them crave maintenance, admission to the accomplished of the anatomy is necessary. Small structures are about accessed with a ladder. Larger structures, which tend to crave added common maintenance, may accept stairs and sometimes a lift, aswell alleged a account elevator.

edit Aircraft admonishing features

Tall structures in balance of assertive allowable heights are generally able with aircraft admonishing lamps, usually red, to acquaint pilots of the structure's existence. In the past, ruggedized and under-run fiber lamps were acclimated to aerate the ball life. Alternatively, neon lamps were used. Nowadays such lamps tend to use LED arrays.

Height requirements alter beyond states and countries, and may cover added rules such as acute a white aflame strobe in the daytime and pulsating red accessories at night. Structures over a assertive acme may aswell be appropriate to be corrective with allegory blush schemes such as white and orange or white and red to accomplish them added arresting adjoin the sky.

edit Ablaze abuse and nuisance lighting

In some countries area ablaze abuse is a concern, belfry heights may be belted so as to abate or annihilate the charge for aircraft admonishing lights. For archetype in the United States the 1996 Telecommunications Act allows bounded jurisdictions to set best heights for towers, such as attached belfry acme to beneath 200 anxiety and accordingly not acute aircraft beam beneath U.S. Federal Communications Commission (FCC) rules. The absolute is added frequently set to 190 or 180 anxiety to acquiesce for masts extending aloft the tower.